SEATTLE – Noting that it could really add some life to her apartment, real estate lawyer Sara Peterson, 31, announced she was ready to give owning a houseplant another shot. “I’m gonna do everything I can this time to make sure it thrives,” Peterson said, reminding herself to not throw out the little instructional tag sticking in the pot. “Last time I’m pretty sure I over-watered it, and the time before that I...